-er c-- ccc ccd cce ccm ccr cdc cdd cde cdm cdr ce- cec ced cee cem cer cmc cmd cme cmm cmr crc crd cre crm crr dcc dcd dce dcm dcr ddc ddd dde ddm ddr de- dec ded dee dem der dmc dmd dme dmm dmr drc drd dre drm drr ec- ecc ecd ece ecm ecr ed- edc edd ede edm edr eec eed eee eem eer em- emc emd eme emm emr erc erd ere erm err m-r mc- mcc mcd mce mcm mcr mdc mdd mde mdm mdr mec med mee mem mer mmc mmd mme mmm mmr mrc mrd mre mrm mrr rcc rcd rce rcm rcr rdc rdd rde rdm rdr re- rec red ree rem rer rmc rmd rme rmm rmr rrc rrd rrm rrr